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The Tasks menu option has been removed from SharePoint Online. Additionally, the Sync to Outlook button on the personal site Tasks page is no longer available. The button may be present in the ribbon but the control is unavailable and doesn't function.

The personal Tasks page will also continue to be available for one year following the announcement that was made on September 4, 2014. After that time, this functionality will be removed and will no longer be available or supported.